Chinese Journal of Organic Chemistry ›› 2020, Vol. 40 ›› Issue (1): 194-200.DOI: 10.6023/cjoc201907001 Previous Articles     Next Articles


杜俊平a, 秦鹏举a, 绪连彩a, 封珊珊a, 徐云祥b, 黄江c   

  1. a 郑州轻工业大学材料与化学工程学院 郑州 450002;
    b 四川大学高分子科学与工程学院 成都 610065;
    c 电子科技大学光电科学与工程学院 成都 610054
  • 收稿日期:2019-07-01 修回日期:2019-09-25 发布日期:2020-02-06
  • 通讯作者: 杜俊平, 黄江;
  • 基金资助:

Synthesis and Photovoltaic Property of Acceptor-Acceptor Conjugated Polymers Based on 4,7-Dithiophene Benzothiadiazole and Isoindigo Units

Du Junpinga, Qin Pengjua, Xu Liancaia, Feng Shanshana, Xu Yunxiangb, Huang Jiangc   

  1. a Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002;
    b College of Polymer Science and Engineering, Sichuan University, Chengdu 610065;
    c School of Optoelectronic Science and Engineering, University of Electronic and Technology of China, Chengdu 610054
  • Received:2019-07-01 Revised:2019-09-25 Published:2020-02-06
  • Supported by:
    Project supported by the National Natural Science Foundation of China (No. 21805248), the Natural Science Foundation of Henan Province (No. 162300410318), the Open Project of Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences (No. K2016-8) and the Doctor Research Project of Zhengzhou University of Light Industry (No. 2013BSJJ017).

An acceptor-acceptor polymer HFTBT-DA865 based on dithiophene benzothiadiazole and isoindigo units has been synthesized by Stille polymerizaiton condensation reaction assisted with microwave. The thermal stability, photophysical properties, electrochemical properties and bulk heterojunction solar cells have been researched in details. This polymer is easily soluble in o-dichlorobenzene, o-xylene and so on, and has excellent solution processing properties. Its 5% thermal decompostion is 389℃ and glass transition temperature is 168℃, which show that the polymer has excellent thermal stability. By optimizing spin coating speed and temperature, the maximum photoelectric conversion efficiency of the polymer solar cell based on HFTBT-DA865 is 2.28%, the open circuit voltage is 0.83 V, the short circuit current is -5.70 mA/cm2, and the filling factor is 48.9%. Electrochemical performance and density functional theory estimates show that the lowest unoccupied molecular orbital (LUMO) values and the planarity of polymer and PC71BM may be the key factors affecting the low power conversion efficiency (PCE). The device performance can be further improved by further optimization of the monomer structure and the acceptor materials. This study about the properties of bulk heterojunction (BHJ) polymer solar cell based on acceptor-acceptor (A-A) typed conjugated polymer shows that this type polymer is a potential polymer solar cell material.

Key words: 4,7-dithiophene benzothiadiazlole, isoindigo, acceptor-acceptor conjugated polymer, photovoltaic, property